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Fig. 3. Means of binned rectified EMG traces of the external intercostal muscle
during hissing whilst running. The rectified EMG trace is sampled relative to
breath (the onset of expiratory airflow to the end of inspiratory airflow) and
relative to stride (peak contralateral limb support to next peak contralateral
limb support). The external intercostal demonstrates no respiratory activity;
rather bursting activity correlates with contralateral limb support.